When half the users are missing in Google Analytics GA4, consent management and tracking blockers are often to blame. However, technical implementation errors also play an important role. Therefore, you should systematically check the most common causes. In this post about missing GA4 users, we explain why user numbers are lower and what you can do about it. We examine both technical and legal aspects.

Why Are So Many Users Missing in GA4?

The biggest factor is GDPR cookie consent. Without consent, no Google tag is loaded and the user remains invisible. This means that depending on consent rates, 30 to 60 percent of visitors are not captured. Additionally, browsers like Safari and Firefox block third-party cookies by default. Also check whether your tag is embedded on all pages, especially on form thank-you pages. Missing tags on individual pages significantly distort overall numbers.

Consent Mode and Modeled Data as a Solution

Google offers Consent Mode v2 as a solution for missing user data. The tag sends anonymized pings even without cookie consent. GA4 uses these signals along with machine learning to model missing users. However, you must implement the advanced Consent Mode correctly. The Google Consent Mode guide explains the setup in detail. Consequently, you can recover up to 70 percent of lost data.

Our Recommendation

Implement the advanced Google Consent Mode v2 together with server-side tagging. This provides modeled data for users who do not give consent. Additionally, optimize your consent rate by making the cookie banner user-friendly. The higher the consent rate, the more accurate your GA4 data will be. Also regularly verify that the tag fires correctly on all pages.

Conclusion

Missing users in GA4 are mainly due to consent requirements and ad blockers. With Consent Mode v2 and server-side tagging, you can significantly reduce the data gap. Our SEO agency supports you with the technical implementation. Also read our post about the disappeared bounce rate in GA4.